Nanomechanical probing of the layer/substrate interface of an exfoliated InSe sheet on sapphire

Van der Waals (vdW) layered crystals and heterostructures have attracted substantial interest for potential applications in a wide range of emerging technologies. An important, but often overlooked, consideration in the development of implementable devices is phonon transport through the structure interfaces. Here we report on the interface properties of exfoliated InSe on a sapphire substrate. We use a picosecond acoustic technique to probe the phonon resonances in the InSe vdW layered crystal. Analysis of the nanomechanics indicates that the InSe is mechanically decoupled from the substrate and thus presents an elastically imperfect interface. A high degree of phonon isolation at the interface points toward applications in thermoelectric devices, or the inclusion of an acoustic transition layer in device design. These findings demonstrate basic properties of layered structures and so illustrate the usefulness of nanomechanical probing in nanolayer/nanolayer or nanolayer/substrate interface tuning in vdW heterostructures

Dementia and COVID-19 in New Zealand, Chile, and Germany: A Research Agenda for Cross-Country Learning for Resilience in Health Care Systems

The COVID-19 pandemic has revealed existing gaps in policies, systems and services, stressing the need for concerted global action on healthy aging. Similar to the COVID-19 pandemic, dementia is a challenge for health systems on a global scale. Our hypothesis is that translational potential lies in cross-country learning by involving three high-income countries with distinct geo political-cultural-social systems in Latin America (Chile), the South Pacific (New Zealand) and Eu rope (Germany). Our vision is that such cross-country learning will lead to providing adequate, equitable and sustainable care and support for families living with dementia during a pandemic and beyond. We are proposing a vision for research that takes a multi-disciplinary, strength-based approach at the intersection of health care research, disaster research, global health research and dementia research. We present some insights in support of our hypothesis and proposed research agenda. We anticipate that this research has the potential to contribute towards strengthening and transforming health care systems in times of crises and beyond

An overview of using small punch testing for mechanical characterization of MCrAlY bond coats

Considerable work has been carried out on overlay bond coats in the past several decades because of its excellent oxidation resistance and good adhesion between the top coat and superalloy substrate in the thermal barrier coating systems. Previous studies mainly focus on oxidation and diffusion behavior of these coatings. However, the mechanical behavior and the dominant fracture and deformation mechanisms of the overlay bond coats at different temperatures are still under investigation. Direct comparison between individual studies has not yet been achieved due to the fragmentary data on deposition processes, microstructure and, more apparently, the difficulty in accurately measuring the mechanical properties of thin coatings. One of the miniaturized specimen testing methods, small punch testing, appears to have the potential to provide such mechanical property measurements for thin coatings. The purpose of this paper is to give an overview of using small punch testing to evaluate material properties and to summarize the available mechanical properties that include the ductile-to-brittle transition and creep of MCrAlY bond coat alloys, in an attempt to understand the mechanical behavior of MCrAlY coatings over a broad temperature range

An sämmtliche Berliner! So eben habe ich die Leiche eines heute an seiner Wunde Gestorbenen ...

Welsch (Projektbearbeiter): Aufruf an die Berliner Bevölkerung, sich trotz der vorangegangenen Barrikadenkämpfe mit dem Militär auszusöhnenv. BrockhusenIn Fraktu

An alle West- und Ostfalen : ein ernstes Wort in Betreff unserer nächsten Zukunft ; nebenbei auch an alle andern deutschen Volksstämme gerichtet ; im Anhange einige Worte über die Gabe der Weissagung im Volke, und die wichtigsten Angaben der Propheten

von W. v. Bruchhause

Zur Dramaturgie der Konsultation

Peters T. Zur Dramaturgie der Konsultation. In: Kaiser C, Bruchhausen W, eds. Szenen des Erstkontakts zwischen Arzt und Patient . Medizin und Kulturwissenschaft. Vol 7. 1st ed. Göttingen: V&R unipress; 2012